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If you observe further, you will notice that every server control is represented by special XML markup. For example, a Label control is represented by an <asp:Label> tag, and a TextBox control is represented by an <asp:TextBox> tag. The part prior to the colon (:) in other words, asp is called a tag prefix. The part after the colon Label or TextBox is called a tag name. Each server control has its ID attribute set to a unique value. The ID of a control is used to access it programmatically. Similarly, every server control has a runat attribute, which must have the value of server and indicates that the tag is server control markup. You will also observe that all the properties that you set via the property window are represented either as attributes or child elements in the server control markup. Thus ASP.NET server control markup is a special vocabulary of XML. Writing Code In this section, you will write some code so that when a user enters valid data and clicks the Submit button, the data is emailed to you. To accomplish this requirement, you need to handle the Click event of the Submit button. Listing 11-8 shows the web form class and the skeleton Click event handler. We ll fill that in next. Listing 11-8. Web Form Class and the Click Event Handler using using using using using using using using using System; System.Data; System.Configuration; System.Web; System.Web.Security; System.Web.UI; System.Web.UI.WebControls; System.Web.UI.WebControls.WebParts; System.Web.UI.HtmlControls;

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Now that you have tested a few templates, we re going to pick it up a notch and manually update your blog s design using CSS and HTML code including images stored to Google Sites.

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Let s take some time to understand the code you just wrote First, you added some configuration settings to the webconfig configuration file webconfig is an external configuration XML file managed by ASPNET This complex and powerful file can include many options regarding the application s security, performance, behavior, and so on Saving data to webconfig is beneficial because you can change it independently of your C# code, which now doesn t need to be recompiled when you change the address of the mail server or the database connection string This detail, combined with the fact that the data access code is written to be database-independent, makes the whole data access code powerful Then, you added the BalloonShopConfiguration class, which is simply a collection of static properties that return data from webconfig Using this class instead of needing to read web.

public partial class _Default : System.Web.UI.Page { protected void Button1_Click(object sender, EventArgs e) { } } The code-behind file contains a partial class named _Default that inherits from the System.Web.UI.Page base class, which provides basic functionality to your web form. Remember that the @Page directive has an attribute called Inherits that refers to this class. The _Default class is marked as partial because only when the markup file (.aspx) and code-behind file (.cs) are combined together, the complete class is generated. This merging happens at run time and is the job of the ASP.NET processing engine. Also, notice several namespaces that are imported at the top. All the namespaces that start with System.Web are physically located in an assembly, System.Web.dll.

config all the time will make your life easier in the long run The performance is improved as well because the class can cache the values read from webconfig instead of reading them on every request The first place you use the BalloonShopConfiguration class is the Utility class, which for now only contains code that sends emails Next, you implemented the GenericDataAccess class, whose purpose is to store a series of common database access operations, to avoid typing it all over again in other places The two methods it contains now are CreateCommand, which creates a DbCommand object, sets some standard properties to it, and returns the configured object If you preferred to use a database-specific command object, such as SqlCommand, the code would have been a bit simpler, but in this case we prefer to have database-independent access code, as explained earlier in this chapter.

The CreateCommand method uses the steps presented earlier in this chapter to create a command object specific to the database implementation you re working with, wrap that instance into a generic DbCommand reference, and return this reference This way, external classes will be able to call CreateCommand to get an already configured with a prepared connection DbCommand object ExecuteSelectCommand, which is essentially a wrapper for DbCommand s ExecuteReader method, except it returns the results as a DataTable instead of a DataReader Using the DataTable ensures that the database connection is kept open as short as possible In this method, you implement an errorhandling technique that guarantees that in case of an exception, the administrator is informed by email (if the application is configured to do so), the database connection is properly closed, and the error is rethrown.

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